<template>
  <div>
    <!-- 滑块验证  开始-->
    <div id="puzzle" ref="puzzle" style="display:inline-block;">
      <!-- :style="'padding:' + 16*scale + 'px ' + 16*scale + 'px ' + 28*scale + 'px;border-radius:'+16*scale+'px;'" -->
      <div class="puzzle-container">
        <div
          :style="
            'position:relative;overflow:hidden;width:' + dataWidth + 'px;'
          "
        >
          <div
            :style="
              'position:relative;width:' +
                dataWidth +
                'px;height:' +
                dataHeight +
                'px;'
            "
          >
            <img
              id="scream"
              ref="scream"
              :src="imgRandom"
              :style="'width:' + dataWidth + 'px;height:' + dataHeight + 'px;'"
            />
            <canvas
              id="puzzle-box"
              ref="puzzleBox"
              :width="dataWidth"
              :height="dataHeight"
            ></canvas>
          </div>
          <div
            class="puzzle-lost-box"
            :style="
              'left:' +
                left_Num +
                'px;width:' +
                dataWidth +
                'px;height:' +
                dataHeight +
                'px;'
            "
          >
            <canvas
              id="puzzle-shadow"
              ref="puzzleShadow"
              :width="dataWidth"
              :height="dataHeight"
            ></canvas>
            <canvas
              id="puzzle-lost"
              ref="puzzleLost"
              :width="dataWidth"
              :height="dataHeight"
            ></canvas>
          </div>
          <p
            class="ver-tips"
            ref="verTips"
            :style="
              'height: ' +
                22 * scale +
                'px;line-height:' +
                22 * scale +
                'px;bottom: ' +
                (displayTips == true ? 0 : -22 * scale) +
                'px;font-size: ' +
                12 * scale +
                'px;'
            "
          >
            <template v-if="verification">
              <span :style="'color:#42ca6b;line-height:' + 22 * scale + 'px;'"
                >验证通过</span
              >
              <span
                :style="
                  'margin-left:' +
                    4 * scale +
                    'px;line-height:' +
                    22 * scale +
                    'px;'
                "
                >哇喔,怪物吃了拼图,快去登录吧~</span
              >
            </template>
            <template v-if="!verification">
              <span :style="'color:red;line-height:' + 22 * scale + 'px;'"
                >验证失败:</span
              >
              <span
                :style="
                  'margin-left:' +
                    4 * scale +
                    'px;line-height:' +
                    22 * scale +
                    'px;'
                "
                >拖动滑块将悬浮图像正确拼合</span
              >
            </template>
          </p>
        </div>
        <div
          class="re-btn"
          @click="refreshImg"
          :style="
            'height: ' +
              28 * scale +
              'px;padding: ' +
              1 * scale +
              'px ' +
              16 * scale +
              'px;font-size: ' +
              18 * scale +
              'px;'
          "
        >
          <!-- <a-icon type="redo" /> -->
        </div>
      </div>
      <br />
      <div class="slider-container" :style="'width:' + dataWidth + 'px;'">
        <div class="slider-bar" :style="'border-radius:' + 24 * scale + 'px;'">
          <p
            class="slider-bar-text select-none"
            onselectstart="return false"
            :style="
              'line-height:' + 28 * scale + 'px;font-size:' + 12 * scale + 'px;'
            "
          >
            按住滑块， 拖动完成上方拼图
          </p>
        </div>
        <div
          class="slider-btn"
          ref="sliderBtn"
          @mousedown="startMove"
          @touchstart="startMove"
          :style="'top: ' + -7 * scale + 'px;'"
        >
          <!-- <a-icon
            type="pause-circle"
            theme="twoTone"
            twoToneColor="#52c41a"
            :style="'font-size: ' + 44 * scale + 'px;'"
          /> -->
          <span class="slider-center-zzz">▍▍▍</span>
        </div>
      </div>
    </div>
    <!-- 滑块验证  结束-->


    <!-- 复制 开始 -->
    <div style="margin-top:50px">
    <input />
        <button type="primary" round size="mini" @click="copyUrl">复制url</button>  
    </div>
    <!-- 复制 结束 -->
  </div>
</template>

<script lang="js">

export default {
  name: 'puzzle',
  data () {
    return {
      moveStart: '',
      displayTips: false,
      verification: false,
      randomX: null,
      randomY: null,
      imgRandom: '',
      left_Num: 0,
      dataWidth: 404,
      dataHeight: 90,
      puzzleSize: 100,
      deviation: 11,
      scale: 1,
      reTimer: null,
      isleavePage: false
    }
  },
  props: {
    width: {
      type: [String, Number],
      default: 340
    },
    height: {
      type: [String, Number],
      default: 120
    },
    cropImage: {
      type: [Boolean],
      default: false
    },
    puzzleImgList: {
      type: Array,
      default: () => [
        'https://fuss10.elemecdn.com/e/5d/4a731a90594a4af544c0c25941171jpeg.jpeg'
      ]
    },
    PlSize: {
      type: [String, Number],
      default: 48
    },
    Deviation: {
      type: [String, Number],
      default: 4
    },
    padding: {
      type: [Number],
      default: 20
    },
    onSuccess: {
      type: Function,
      default: () => {
        alert('验证成功')
      }
    },
    onError: {
      type: Function,
      default: () => {
        alert('验证失败')
      }
    }
  },
  methods: {

     copyUrl() {
      const input = document.createElement('input')
      document.body.appendChild(input)
      input.setAttribute('value',"这里可以写变量或者要复制的字符串内容")
      input.select()
      if (document.execCommand('copy')) {
        document.execCommand('copy')
      }
      document.body.removeChild(input)
     },
    /* 刷新 */
    RandomNum (Min, Max) {
      const Range = Max - Min + 1
      const Rand = Math.random()
      return Min + Math.floor(Rand * Range)
    },
    refreshImg () {
      const imgRandomNum = this.RandomNum(0, this.puzzleImgList.length - 1)
      this.imgRandom = this.puzzleImgList[imgRandomNum]
      this.initCanvas()
    },
    /* 画布初始化 */
    initCanvas () {
      this.clearCanvas()

      // const self = this
      const w = this.dataWidth
      const h = this.dataHeight
      // const PL_Size = 48
      // 2019-02-12开始PL_Size使用可传递参数
      const PL_Size = this.puzzleSize
      const padding = 20
      const MinN_X = padding + PL_Size
      const MaxN_X = w - padding - PL_Size - PL_Size / 6
      const MaxN_Y = padding
      const MinN_Y = h - padding - PL_Size - PL_Size / 6
      this.randomX = this.RandomNum(MinN_X, MaxN_X)
      this.randomY = this.RandomNum(MinN_Y, MaxN_Y)
      const X = this.randomX
      const Y = this.randomY
      this.left_Num = -X + 10
      const d = PL_Size / 3

      const c = this.$refs.puzzleBox
      const c_l = this.$refs.puzzleLost
      const c_s = this.$refs.puzzleShadow
      const ctx = c.getContext('2d')
      const ctx_l = c_l.getContext('2d')
      const ctx_s = c_s.getContext('2d')
      ctx.globalCompositeOperation = 'xor'
      ctx.shadowBlur = 10
      ctx.shadowColor = '#fff'
      ctx.shadowOffsetX = 3
      ctx.shadowOffsetY = 3
      ctx.fillStyle = 'rgba(0,0,0,0.7)'
      ctx.beginPath()
      ctx.lineWidth = '1'
      ctx.strokeStyle = 'rgba(0,0,0,0)'
      ctx.moveTo(X, Y)
      ctx.lineTo(X + d, Y)
      ctx.bezierCurveTo(X + d, Y - d, X + 2 * d, Y - d, X + 2 * d, Y)
      ctx.lineTo(X + 3 * d, Y)
      ctx.lineTo(X + 3 * d, Y + d)
      ctx.bezierCurveTo(X + 2 * d, Y + d, X + 2 * d, Y + 2 * d, X + 3 * d, Y + 2 * d)
      ctx.lineTo(X + 3 * d, Y + 3 * d)
      ctx.lineTo(X, Y + 3 * d)
      ctx.closePath()
      ctx.stroke()
      ctx.fill()

      const img = new Image()
      img.src = this.imgRandom
      img.onload = function () {
        ctx_l.beginPath()
        ctx_l.strokeStyle = 'rgba(0,0,0,0)'
        ctx_l.moveTo(X, Y)
        ctx_l.lineTo(X + d, Y)
        ctx_l.bezierCurveTo(X + d, Y - d, X + 2 * d, Y - d, X + 2 * d, Y)
        ctx_l.lineTo(X + 3 * d, Y)
        ctx_l.lineTo(X + 3 * d, Y + d)
        ctx_l.bezierCurveTo(X + 2 * d, Y + d, X + 2 * d, Y + 2 * d, X + 3 * d, Y + 2 * d)
        ctx_l.lineTo(X + 3 * d, Y + 3 * d)
        ctx_l.lineTo(X, Y + 3 * d)
        ctx_l.closePath()
        ctx_l.stroke()
        ctx_l.shadowBlur = 10
        ctx_l.shadowColor = 'black'
        ctx_l.clip()
        ctx_l.drawImage(img, 0, 0, w, h)
      }
      ctx_s.beginPath()
      ctx_s.lineWidth = '1'
      ctx_s.strokeStyle = 'rgba(0,0,0,0)'
      ctx_s.moveTo(X, Y)
      ctx_s.lineTo(X + d, Y)
      ctx_s.bezierCurveTo(X + d, Y - d, X + 2 * d, Y - d, X + 2 * d, Y)
      ctx_s.lineTo(X + 3 * d, Y)
      ctx_s.lineTo(X + 3 * d, Y + d)
      ctx_s.bezierCurveTo(X + 2 * d, Y + d, X + 2 * d, Y + 2 * d, X + 3 * d, Y + 2 * d)
      ctx_s.lineTo(X + 3 * d, Y + 3 * d)
      ctx_s.lineTo(X, Y + 3 * d)
      ctx_s.closePath()
      ctx_s.stroke()
      ctx_s.shadowBlur = 20
      ctx_s.shadowColor = 'black'
      ctx_s.fill()
    },
    /* 通过重置画布尺寸清空画布，这种方式更彻底 */
    clearCanvas () {
      const c = this.$refs.puzzleBox
      const c_l = this.$refs.puzzleLost
      const c_s = this.$refs.puzzleShadow
      c.setAttribute('height', c.getAttribute('height'))
      c_l.setAttribute('height', c.getAttribute('height'))
      c_s.setAttribute('height', c.getAttribute('height'))
      // c.height = c.height
      // c_l.height = c_l.height
      // c_s.height = c_s.height
    },
    /* 按住滑块后初始化移动监听，记录初始位置 */
    startMove (e) {
      console.log(e)
      e = e || window.event
      this.$refs.sliderBtn.style.backgroundPosition = '0 -216px'
      this.moveStart = e.pageX || e.targetTouches[0].pageX
      this.addMouseMoveListener()
    },
    /* 滑块移动 */
    moving (e) {
      const self = this
      e = e || window.event
      const moveX = e.pageX || e.targetTouches[0].pageX
      const d = moveX - self.moveStart
      const w = self.dataWidth
      const PL_Size = this.puzzleSize
      const padding = 20
      if (self.moveStart === '') {
        return ''
      }
      if (d < 0 || d > (w - padding - PL_Size)) {
        return ''
      }
      self.$refs.sliderBtn.style.left = d + 'px'
      self.$refs.sliderBtn.style.transition = 'inherit'
      self.$refs.puzzleLost.style.left = d + 'px'
      self.$refs.puzzleLost.style.transition = 'inherit'
      self.$refs.puzzleShadow.style.left = d + 'px'
      self.$refs.puzzleShadow.style.transition = 'inherit'
    },
    /* 移动结束，验证并回调 */
    moveEnd (e) {
      const self = this
      e = e || window.event
      const moveEnd_X = (e.pageX || e.changedTouches[0].pageX) - self.moveStart
      const ver_Num = self.randomX - 10
      const deviation = this.deviation
      const Min_left = ver_Num - deviation
      const Max_left = ver_Num + deviation
      if (self.moveStart !== '') {
        if (Max_left > moveEnd_X && moveEnd_X > Min_left) {
          self.displayTips = true
          self.verification = true
          setTimeout(function () {
            if (self.isleavePage) {
              return
            }
            self.displayTips = false
            self.initCanvas()
          }, 2000)
          /* 成功的回调函数 */
          self.onSuccess()
        } else {
          self.displayTips = true
          self.verification = false
          setTimeout(function () {
            if (self.isleavePage) {
              return
            }
            self.displayTips = false
          }, 2000)
          /* 失败的回调函数 */
          self.onError()
        }
      }
      if (typeof (self.$refs.sliderBtn) !== 'undefined' && typeof (self.$refs.puzzleLost) !== 'undefined' && typeof (self.$refs.puzzleShadow) !== 'undefined') {
        self.reTimer = setTimeout(function () {
          if (self.isleavePage) {
            return
          }
          self.$refs.sliderBtn.style.left = 0
          self.$refs.sliderBtn.style.transition = 'left 0.5s'
          self.$refs.puzzleLost.style.left = 0
          self.$refs.puzzleLost.style.transition = 'left 0.5s'
          self.$refs.puzzleShadow.style.left = 0
          self.$refs.puzzleShadow.style.transition = 'left 0.5s'
        }, 1000)
        self.$refs.sliderBtn.style.backgroundPosition = '0 -84px'
      }
      self.moveStart = ''
    },
    /* 绑定滑块移动与滑动结束，移动过程中鼠标可在绑定的区域 */
    addMouseMoveListener () {
      const self = this
      document.addEventListener('mousemove', self.moving)
      document.addEventListener('touchmove', self.moving)
      document.addEventListener('mouseup', self.moveEnd)
      document.addEventListener('touchend', self.moveEnd)
    }

  },
  mounted () {
    const self = this
    this.dataWidth = this.$refs.puzzle.clientWidth * 0.884
    this.dataHeight = this.dataWidth * (this.height / this.width)
    this.scale = this.$refs.puzzle.clientWidth / 260
    this.puzzleSize = this.dataWidth * (this.PlSize / this.width)
    setTimeout(self.refreshImg, 0)
  },
  created () {
    const imgRandomNum = this.RandomNum(0, this.puzzleImgList.length - 1)
    this.imgRandom = this.puzzleImgList[imgRandomNum]
    this.puzzleSize = Number(this.PlSize)
    this.deviation = Number(this.Deviation)

    // this.dataWidth = this.width
    // this.dataHeight = this.height
    // this.scale = this.width/260
  },
  watch: {
  },
  beforeDestroy () {
    this.isleavePage = true
  }
}
</script>

<style scoped>
.slider-btn {
  position: absolute;
  width: 90px;
  height: 67px;
  left: 0;
  top: -7px;
  z-index: 12;
  cursor: pointer;
  background-position: 0 -84px;
  transition: inherit;
  background-color: #f4f7fe;
  border-radius: 45%;
  display: flex;
}
.slider-center-zzz {
  text-align: center;
  line-height: 67px;
  position: absolute;
  color: #53c300;
  height: 40px;
  width: 100%;
}
.ver-tips {
  position: absolute;
  left: 0;
  bottom: -22px;
  background: rgba(255, 255, 255, 0.9);
  height: 22px;
  line-height: 22px;
  font-size: 12px;
  width: 100%;
  margin: 0;
  text-align: left;
  padding: 0 8px;
  transition: all 0.4s;
}
.slider-tips {
  bottom: 0;
}
.ver-tips i {
  display: inline-block;
  width: 22px;
  height: 22px;
  vertical-align: top;
  background-position: -4px -1229px;
}
.ver-tips span {
  display: inline-block;
  vertical-align: top;
  line-height: 22px;
  color: #455;
}
.active-tips {
  display: block;
}
.hidden {
  display: none;
}
.re-btn {
  position: absolute;
  left: 0;
  bottom: 0;
  height: 28px;
  padding: 0 16px;
}
.re-btn a {
  display: inline-block;
  width: 14px;
  height: 14px;
  margin: 0px 0;
  background-position: 0 -1179px;
  cursor: pointer;
}
.re-btn a:hover {
  background-position: 0 -1193px;
}

.puzzle-container {
  position: relative;
  /* padding: 16px 16px 28px; * /
  /* border: 1px solid #ddd; */
  background: #e0e1e3;
  /* border-radius: 16px; */

  /* height: 83px;  */
  /* width: 340px; */
}
.slider-container {
  position: relative;
  margin: auto;
}
.slider-bar {
  border: 1px solid #c3c3c3;
  border-radius: 24px;
  background: #e0e1e3;
  box-shadow: 0 1px 1px rgba(12, 10, 10, 0.2) inset;
}
.slider-bar-text {
  font-size: 12px;
  color: #486c80;
  line-height: 28px;
  margin: 0;
  text-align: right;
  padding-right: 22px;
}

#puzzle-box {
  position: absolute;
  left: 0;
  top: 0;
  z-index: 22;
}
#puzzle-shadow {
  position: absolute;
  left: 0;
  top: 0;
  z-index: 22;
}
#puzzle-lost {
  position: absolute;
  left: 0;
  top: 0;
  z-index: 33;
}
.puzzle-lost-box {
  position: absolute;
  width: 260px;
  height: 116px;
  left: 0;
  top: 0;
  z-index: 111;
}
</style>
